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2015 ; 16
(2
): 234-48
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ACE-inhibition increases podocyte number in experimental glomerular disease
independent of proliferation
#MMPMID25143333
Zhang J
; Yanez D
; Floege A
; Lichtnekert J
; Krofft RD
; Liu ZH
; Pippin JW
; Shankland SJ
J Renin Angiotensin Aldosterone Syst
2015[Jun]; 16
(2
): 234-48
PMID25143333
show ga
OBJECTIVE: The objective of this article is to test the effects of
angiotensin-converting enzyme (ACE)-inhibition on glomerular epithelial cell
number in an inducible experimental model of focal segmental glomerulosclerosis
(FSGS). BACKGROUND: Although ACE-inhibition has been shown to limit podocyte loss
by enhancing survival, little is known about its effect on podocyte number
following an abrupt decline in disease. METHODS: Experimental FSGS was induced
with cytotoxic antipodocyte antibody. Following induction, groups were randomized
to receive the ACE-inhibitor enalapril, the smooth muscle relaxant hydralazine
(blood pressure control) or drinking water. Blood pressure, kidney function and
histology were measured seven and 14 days following disease induction. RESULTS:
Both glomerulosclerosis and urinary albumin-to-creatinine ratio were less in the
ACE-inhibition arm at day 14. At day 7 of disease, mean podocyte numbers were 26%
and 29% lower in the enalapril and hydralazine arms, respectively, compared to
normal mice in which no antibody was injected. At day 14, the mean podocyte
number was only 18% lower in the enalapril arm, but was 39% lower in the
hydralazine arm compared to normal mice. Podocyte proliferation did not occur at
any time in any group. Compared to water- or hydralazine-treated mice with FSGS,
the enalapril arm had a higher mean number of glomerular parietal epithelial
cells that co-expressed the podocyte proteins WT-1 and synaptopodin, as well as
phospho-ERK. CONCLUSION: The results show following an abrupt decline in podocyte
number, the initiation of ACE-inhibition but not hydralazine, was accompanied by
higher podocyte number in the absence of proliferation. This was accompanied by a
higher number of parietal epithelial cells that co-express podocyte proteins.
Increasing podocyte number appears to be accompanied by reduced
glomerulosclerosis.
|Angiotensin-Converting Enzyme Inhibitors/pharmacology/*therapeutic use
[MESH]